Positive critical Hausdorff measure conjecture for random Cantor sets

Let FF be the random Cantor set generated by the tree of coin flips with contraction ratio rr, let M>NM>N, and let the symmetric probability vector be

p=(1/N,,1/N).\mathbf{p}=(1/N,\dots,1/N).

Set

s=logNlogr.s=-\frac{\log N}{\log r}.

Positive critical Hausdorff measure conjecture. With probability one with respect to μp\mu_{\mathbf{p}},

Hs(F)>0.\mathcal{H}^s(F)>0.

The preceding dichotomy result shows that the normalized expected number of surviving intervals converges to a positive limit when M>NM>N, suggesting positivity of the Hausdorff measure at the critical dimension. The claim is stated as a conjecture because the paper does not establish it.

Sources & referencesView supporting material

Primary source

Pieter Allaart and Taylor Jones, “Random subsets of Cantor sets generated by trees of coin flips”, arXiv:2308.04569 (2024).

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